Editor’s Note: Today’s story is the answer to the July Puzzle. Call it an alluvial showdown. At the southern tip of Severny Island in the Russian Arctic, rivers descend from rugged terrain flanking a wide valley. Upon reaching flatter terrain, the waters slow down and distribute the sediments in the shape of cones called alluvial
This month, engineers at NASA’s Jet Propulsion Laboratory in Southern California are testing a spacecraft sensor that will help measure how quickly Arctic sea ice is disappearing. And although that instrument won’t launch for another year, scientists began preparing for its use during a recent field campaign in the Canadian wilderness. The researchers spent two